分层缺陷对复合材料壳体裙连接区轴向承载性能影响分析  

Study of delamination defects impact on axial load⁃bearing capacity of lap structure between skirt and composite case

作　　者：沈镇[1] 席近远 杨东 王晨 校金友[2] 刘新东[1] SHEN Zhen;XI Jinyuan;YANG Dong;WANG Chen;XIAO Jinyou;LIU Xindong(Xi'an Aerospace Composite Research Institute,Xi’an 710025,China;Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西安航天复合材料研究所,西安710025 [2]西北工业大学,西安710072

出　　处：《固体火箭技术》2023年第6期930-937,共8页Journal of Solid Rocket Technology

摘　　要：为掌握固体发动机复合材料壳体裙连接区在复合材料界面分层缺陷状态下的承载性能,基于损伤失效分析方法研究了裙连接区不同界面、不同位置存在不同大小的复合材料分层/脱粘缺陷时的承载能力,分析了缺陷对裙连接区结构局部屈曲、裂纹扩展及损伤失效的影响规律。结果表明,复合材料层间界面存在临界缺陷尺寸,当缺陷小于临界尺寸时,结构承载能力基本不变,当缺陷大于该临界尺寸时,连接区的失效形式和极限载荷均受到较大影响;对于复合材料轴向补强层与环向缠绕层之间的初始分层缺陷而言,当缺陷位置处于裙连接区过渡层轴向位置之后时,裙连接区的承载方式无明显变化,仍受整体屈曲的控制;但缺陷位置与裙连接区过渡层轴向位置相同时,则易发生局部屈曲,对连接区承载能力影响较大。To understand the axial load-bearing capacity of the lap structure between skirt and composite case(LBSCC)of sol-id rocket motor under the condition of delamination defects at the composite interface,the load-bearing capacity of the LBSCC with different delamination/debonding sizes at different interfaces and positions were studied with the damage failure analysis method.The effects of defects on the local bucking,crack growth and damage failure are also analyzed.The results show that there is a critical size for the delamination defect at the composite interface,and when the defect dimension is smaller than the critical size,the bearing ca-pacity of the structure is basically unchanged,while the defect dimension is larger than this size,the failure types and bearing capac-ity of the LBSCC is materially affected by the defect.For the initial delamination defect presenting in the composite interface of the axial reinforcement composite layer and the circumferential winding composite layer,the load-bearing mode for the LBSCC doesn't show significant change as the delamination defect located at the inside region of the axial position of the transition layer.While the delamination defect located at the same region of the axial position of the transition layer,it is prone to local buckling,which has great impact on the bearing performance for the LBSCC.

关 键 词：复合材料壳体裙连接区 分层缺陷 损伤失效分析 轴向承载 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]